Blender Git Loki

Fix issues reported by gcc address sanitizer

* paint curves and palettes should be freed after brushes
* out of bounds write in transform code.

Fix T40128, curve operators "leaked" in non-paint modes

Use operand for masking. Corrects loading a file with masking not
showing the color.

Tweaks to mask brush:

* Paint the "correct" value independent of inverted mask.
* Always turn on masking when painting with the mask tool.

Fix swimming textures on 2D painting with textured brushes + pressure.

When sampling the old texture buffer we need to account for the diameter
change in the sampling offset as well.

Make sure mesh is updated when we change the stencil layer. Takes care
of updating the stencil preview.

Merge branch 'master' into soc-2013-paint

Conflicts:
source/blender/editors/sculpt_paint/paint_image_2d.c

Merge branch 'master' into soc-2013-paint

Support inverting the mask brush value

Fix fill brush threshold not exposed after recent UI changes.

Disable stencil masking if there's no stencil image set.

Merge branch 'master' into soc-2013-paint

UI cleanup:

Only expose material list if more than one material present.

Reuse old regular drawing even in cycles for non-material mode in
texture paint. This enables us to see stencil masking even then.

Merge branch 'master' into soc-2013-paint

Conflicts:
source/blender/editors/sculpt_paint/paint_image.c
source/blender/editors/sculpt_paint/paint_image_2d.c
source/blender/editors/sculpt_paint/paint_image_proj.c

Add evil warning when object does not have a UV map. It would be ideal
to generate a UV map, but I think algorithms all require edit mode.

Add select mouse drag to initiate grab for paint curves.

Paint Curves:

Avoid transform if no curve is active.

Fix irritating issue with cursor display.

It seems tpage reset was not occuring because new display code did not
update those data at all. Now force OpenGL update properly and
also add a forced way to clear the tpage.

Enable stencil display for legacy display in texture painting.

Also, don't always pass stencil texture coordinates, only in texture
paint mode.

+ fix compilation after merge